Spark plug wire



FIG. 1 is a front perspective view of a spark plug wire showing my new design;

FIG. 2 is an enlarged side elevational view thereof;

FIG. 3 is an enlarged cross-sectional view taken along line 3—3 of FIG. 2 thereof; and,

FIG. 4 is an additional enlarged side elevational view thereof.

The portion of the wire shown in broken lines is understood to form no part of the claimed design, and the broken-line edge of the patterned portion is understood to form an unclaimed boundary of the claimed design. 

The ornamental design for a spark plug wire, as shown and described. 